The enclosure has 1/2 inch cement board screwed directly on top of the wood
studs. The tile (4x4 irregular edge) is going to be installed directly onto
the cement board. Is this adequate protection for moisture.
Additionally the cement board extends about 3 inches beyond the dry side of
the shower enclosure where it butts up against green board and had been
feathered in to the greenboard with mesh tape and drywall mud.
Is there any problem with this type of installation.
Most tiled shower leaks are a result of the shower pan leaking. That is
the membrane used in the basin. So what is your basin made of? Tile,
plastic pan? Another source of leakage can be the transition from tile
to plastic shower pan.
So you're tiling just 2 walls. Without drywall behind the cement board
will the cement board overlap the lip on the back of the Kohler basin?
If so you shouldn't have any problems. Personally I use mortar
substrates for all tile applications, but even so the cement board would
be better if placed over drywall. Less flex between the studs. Leave
the bottom row of tile up an 1/8" off of the basin and use (i hate to
say it) silicone at that joint.
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